eloborate what happens in the middle of the night to the tent and its immatees on rainy day

From the text:

".... you dream that an elephant has suddenly sat down on your chest, and that the volcano has exploded and thrown you down to the bottom of the sea—the elephant still sleeping peacefully on your bosom. You wake up and grasp the idea that something terrible really has happened. Your first impression is that the end of the world has come; and then you think that this cannot be, and that it is thieves and murderers, or else fire, and this opinion you express in the usual method. No help comes, however, and all you know is that thousands of people are kicking you, and you are being smothered."